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            <h1 style="display: none">redis相关问题</h1>
            
            
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                <h3 id="Redis为什么这么快？请从至少5个方面详细解释。"><a href="#Redis为什么这么快？请从至少5个方面详细解释。" class="headerlink" title="Redis为什么这么快？请从至少5个方面详细解释。"></a>Redis为什么这么快？请从至少5个方面详细解释。</h3><ul>
<li>reid 是直接从内存读取的减少了i/o读取时间</li>
<li>redise 是key-value存储，且包含 多种数据结构，数据结构简单，性能高</li>
<li>reid是但线程的 避免多线程的上下文切换</li>
<li>redis是非阻塞I/O： 一步处理网络请求，不阻塞主线程</li>
<li>redis 是C写的，更接近底层</li>
</ul>
<h3 id="在电商网站中，如何使用Redis的不同数据结构来实现以下功能？"><a href="#在电商网站中，如何使用Redis的不同数据结构来实现以下功能？" class="headerlink" title="在电商网站中，如何使用Redis的不同数据结构来实现以下功能？"></a>在电商网站中，如何使用Redis的不同数据结构来实现以下功能？</h3><ol>
<li>商品详情缓存<br>采用hash数据结构</li>
</ol>
<figure class="highlight bash"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br></pre></td><td class="code"><pre><code class="hljs bash">hset product:1 name <span class="hljs-string">&quot;商品1&quot;</span> price 10 stock 100<br><span class="hljs-comment"># 获取商品所有信息</span><br>hgetall product:1<br><span class="hljs-comment"># 获取商品名称</span><br>hget tproduct:1 name<br></code></pre></td></tr></table></figure>
<ol start="2">
<li><p>购物车功能<br>采用hash数据结构，key为用户id，value为商品id和数量</p>
<figure class="highlight bash"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br></pre></td><td class="code"><pre><code class="hljs bash">hset cart：userId  productId1 1 productId2 2 <span class="hljs-comment"># 商品信息</span><br>HINCRBY cart:userId:productId1 1 <span class="hljs-comment">#商品加一</span><br></code></pre></td></tr></table></figure></li>
<li><p>商品浏览次数统计<br>采用 String + incr 如果需要排行的话采用 zset</p>
<figure class="highlight bash"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br></pre></td><td class="code"><pre><code class="hljs bash"><span class="hljs-built_in">set</span> product:1:views 0<br>incr product:1:views   <span class="hljs-comment"># 增加浏览次数</span><br>incrby product:1:views 3 <span class="hljs-comment"># 增加指定次数</span><br></code></pre></td></tr></table></figure></li>
<li><p>用户最近浏览记录<br>采用 list 和 ltrim</p>
<figure class="highlight bash"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br></pre></td><td class="code"><pre><code class="hljs bash">lpush user:1:views productId1 productId2 productId3 <span class="hljs-comment"># 添加商品</span><br>lpush user:1:views productId1<br>ltrim user:1:views 0 10  <span class="hljs-comment"># 保留前十条 删除多余的浏览记录</span><br></code></pre></td></tr></table></figure></li>
</ol>
<ol start="5">
<li>商品销量排行榜<br>创建一个zset <figure class="highlight bash"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br></pre></td><td class="code"><pre><code class="hljs bash">zincrby sales_rank productId1 100 <span class="hljs-comment"># 添加商品</span><br>zincrby sales_rank productId2 50<br>zrevrange sales_rank 0 10 <span class="hljs-comment"># 获取前十条</span><br></code></pre></td></tr></table></figure></li>
</ol>
<h3 id="RDB和AOF两种持久化方式各自的优缺点是什么？在生产环境中如何选择和配置？"><a href="#RDB和AOF两种持久化方式各自的优缺点是什么？在生产环境中如何选择和配置？" class="headerlink" title="RDB和AOF两种持久化方式各自的优缺点是什么？在生产环境中如何选择和配置？"></a>RDB和AOF两种持久化方式各自的优缺点是什么？在生产环境中如何选择和配置？</h3><ul>
<li><p>RDB：是采用快照的形式每隔一段时间将数据写入到 磁盘中 </p>
<figure class="highlight bash"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br></pre></td><td class="code"><pre><code class="hljs bash">save 900 1          <span class="hljs-comment"># 15分钟至少1个key变化</span><br>save 300 10         <span class="hljs-comment"># 5分钟至少10个key变化  </span><br>save 60 10000       <span class="hljs-comment"># 1分钟至少10000个key变化</span><br></code></pre></td></tr></table></figure></li>
<li><p>AOF：是将reids的操作追加 到一个日志文件中，然后通过一个线程从日志文件中恢复数据<br>RDB 优点： 恢复快，备份小 缺点： 数据一致性差，可能会丢失，fork子进程的时候 容易阻塞<br>AOF 优点： 数据一致性高 缺点： 占用磁盘空间大， 数据恢复慢</p>
</li>
</ul>
<h3 id="主从复制、哨兵模式、Cluster集群三种高可用方案的区别和适用场景是什么？"><a href="#主从复制、哨兵模式、Cluster集群三种高可用方案的区别和适用场景是什么？" class="headerlink" title="主从复制、哨兵模式、Cluster集群三种高可用方案的区别和适用场景是什么？"></a>主从复制、哨兵模式、Cluster集群三种高可用方案的区别和适用场景是什么？</h3><ul>
<li>主从复制：主库写入从节点复制，实现读写分离，适用于访问频率高的情况，读多写少的情况。</li>
<li>哨兵机制： 从节点会从主节点复制，主节点挂了，会从从节点选一个座位主节点，适用于稳定的系统，故障自动转移。</li>
<li>Cluster集群： 集群是多个节点组成的，每个节点都保存了数据，数据是分布的，适用于大数据量高并发的情况。</li>
</ul>
<h3 id="如何用Redis实现一个分布式秒杀系统？需要考虑哪些并发问题和解决方案？"><a href="#如何用Redis实现一个分布式秒杀系统？需要考虑哪些并发问题和解决方案？" class="headerlink" title="如何用Redis实现一个分布式秒杀系统？需要考虑哪些并发问题和解决方案？"></a>如何用Redis实现一个分布式秒杀系统？需要考虑哪些并发问题和解决方案？</h3><p>采用分布式锁 ，</p>
<ul>
<li>然后将库存信息直接放到redis中，库存的增减直接操作redis，如果库存为0直接返回失败，</li>
<li>创建一个队列，将用户信息存入队列，系统慢慢去消费队列，处理业务逻辑</li>
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      contentSelector : '.markdown-body',
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      collapsibleClass: 'tocbot-is-collapsible',
      scrollSmooth    : true,
      includeTitleTags: true,
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